Keep a little perspective here. Chip is young (as are most the dogs mentioned in this thread) and you've just started structured training with him. He's doing good, you both are.
What you are talking about here is "proofing" your dogs so they respond or ignore or whatever all the time. That takes time, patience, work, training, more time, more patience, more work and more training. Don't be too hard on yourselves or your corgis and expect too much too soon. It is coming, I can see it in your posts.
Another little tidbit to file away for future reference; it is a part of the corgi rule book to do all training classes exercises perfectly at home and then forget they even have a name, much less have a clue as to what the command just given to them means when not at home. This is just a way of making sure their owners stay on their toes.
Debbie
PS: Yay Dudley on the great recall!